https://cdn.pfizer.com/pfizercom/2020-11/C4591001_Clinical_Protocol_Nov2020.pdf

Read the sections on environmental exposure.

Why does Pfizer want to know within 24 hours if an injected person has been in contact with, say. a man whose wife is pregnant?

And why do they say you need to prevent conception while in the study?

Why do they have a section on terminating pregnancy?

5.3.1. Contraception

"In addition, the investigator or designee will instruct the participant to call immediately if the selected contraception method is discontinued or if pregnancy is known or suspected in the participant or partner."

Exposure during pregnancy (EDP)

A female is found to be pregnant while being exposed or having been exposed to study intervention due to environmental exposure. Below are examples of environmental exposure during pregnancy:

• A female family member or healthcare provider reports that she is pregnant after having been exposed to the study intervention by inhalation or skin contact.

• A male family member or healthcare provider who has been exposed to the study intervention by inhalation or skin contact then exposes his female partner prior to or around the time of conception.

The investigator must report EDP to Pfizer Safety within 24 hours of the investigator’s awareness, irrespective of whether an SAE has occurred. The initial information submitted should include the anticipated date of delivery (see below for information related to termination of pregnancy).